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INC. <br /> GETTLER - RYAN <br /> October 12, 2000 <br /> G-R Job#180175 <br /> Mr. Edward C.Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 1.20 <br /> Roseville, California 95661 <br /> RE: Third Quarter 2000 Groundwater Monitoring & Sampling Report <br /> Tosco(Former BP Oil) Service Station#11195 <br /> 16500 South I-5 <br /> Lathrop,California <br /> Dear Mr: Ralston: <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Getder-Ryan <br /> Inca(G-R)..On August 28,2000,field personnel monitored and,sampled eleven wells (MW-1 through_ MW-6. <br /> and MW-8 through MW-12) at the above referenced site. <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase <br /> hydrocarbons. Separate-phase hydrocarbons were not present in the wells. A Potentiometric Map in in <br /> as Figure 1. Dissolved oxygen concentrations are presented in Table 3. Static water level data and groundwater- <br /> elevations are summarized in Table 1: <br /> Groundwater samples were collected from the monitoring wells as specified,by G-R. Standard Operating <br /> .Procedure -..Groundwater Sampling (attached). The field data sheets are also attached. The samples were <br /> analyzed by Sequoia Analytical.. Analytical results are summarized in Tables 1 and-2. A Concentration.Map <br /> in included as Figure 2.. The chain of custody document and laboratory.analytical reports are also attached. <br /> cerely, <br /> -Deanna L.L. Harding 0 GES( <br /> Project Coordinator. �k.�'`pVG�S J. <br /> No. 6882 <br /> Dou as ,Lee <br /> Senior Ge logist,R.G. 6882 <br /> Figure 1: Poterttiometric Ma �TFOF <br /> P <br /> Figure 2: Concentration Map <br /> Table 1: Groundwater Monitoring.Data and.Analytical Results <br /> Table 2: Groundwater Analytical Results-Oxygenate Compounds <br /> Table.3: Dissolved Oxygen Concentrations <br /> Attachments: Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 11195.gml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra . Court , Suite J Dublin , California 94568 ( 925 ) 551 -7555 <br />